Dowel-pin.



E. TYDEN.

DOWEL PIN.

(Application med Feb. s, 1906.)

No. 653,328. Patented luly l0, |900.

(No IIQdel.) V

NTTED STATES PATENT OFFICE.

EMIL TYDEN, OF HASTINGS, MICHIGAN.

DOWEL-PIN.

SPECIFICATION forming part of Letters Patent No. 653,328, dated July 10, 1900. Application filed February 5, 1900. Serial No. 3,971. (No model.)

To all whom it may concern:

Be it known that I, EMIL TYDEN, a citizen of the United States, residing at Hastings, county of Barry, State of Michigan, have invented certain new and useful Improvements in Dowel-Pins and Sockets for Extension-Tables, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof.

The purpose of this invention is to provide an improved dowel-pin or tenon device and socket to coperate with it for use in connecting the leaves or fillers of extension-tables with each other and with the adjacent boards of the table-top.

In the drawings, Figure l is a plan of my improved dowel-pin. Fig. 2 is a side elevation of the same shownin the board in which it is rooted, the board being shown in vertical section. Fig. 3 is a section on an enlarged scale at the line 3 3 on Fig. 1. tion of the board having the socket, showing a socket escutcheon-plate in place thereon. Fig. 5 is an edge elevation of the board with the escutcheon-plate in place thereon.

My improved dowel-pin is made of metal rod or Wire, preferably cylindrical in original form, the embedded or root portion of which is struck between dies to produce a thinned and widened portion A', which commences a short distance from the inner end, leaving a terminal portion A2 beyond suchthinned portion in its original cylindrical form to serve as a pilot or guiding portion for the pin in entering it into the wood. The thinning and consequent widening of the portion A' form laterally-projecting fins A10 A10, and in order that they maybe adapted to cleave the grain of the wood as the pin is driven into glass with as little liability as possible to crush or break the grain or split the wood the metal is forced in the die to thin lateral edges, and in order to leave the pin with adequate strength at this neck or thinned portion, notwithstanding the thinness which is desired and obtained at the edges of the fins, said neck is made so that in cross-section it tapers from a thicker point at the middle of the width to said lateral thin edges of the fins, as seen in Fig. 3. Preferably also the metal is c shaped in the dies at this neck or thinned and widened portion so that there is formed at Fig. 4 is a secthe end thereof adjacent the pilot portion A2 a comparatively-abrupt shoulder a2, while the surface slopes gradually in the other direction, as seen at as, to the oiher endof said neck, where the middle ridge of 'the neck merges in the original cylindrical surface of the rod or wire of which the pin is made. Preferably the embedded or root portion of the pin comprises some of the original cylindrical portion of the rod beyond (that is, out- Ward from) the neck A; but this will depend upon the depth to which the user drives the pin into the wood C. But in any event the pin comprises a protruding or tenen portion A3, having a tapered terminal A30, the taper being sufficiently long to cause the pin to be easily guided into the socket D provided for it in the adjacent board D, and having back of such tapered terminal a non-tapered or straight portion A31 of sufficient length to afford good engagement for the tenon in the socket.

The purpose of the form of the tenon portion of this dowel-pin is to adapt it to enter the socket of the adjacent board notwithstanding the warping of either or both of the boards, and in order to accomplish this purpose evidently it is necessary that the pin should have at the tenon portion a radius equal to the maximum defiection or displace ment due to the warping of the boards. y This necessitates greater diameter for the pin than would be necessary merely forthe necessary strength and makes it impracticable to metalline the socket, because the thickness of such lining added on both sides to the diameter of the pin would require so large a bore in the wood as to leave aninsuflicient amount for' strength above and below, especially in view of the fact that the lining would have to be driven in tightly and would in that process severely strain the thin remaining portion of wood above and below it, which would, furthermore, be constantly exposed to additional strains of the same nature whenever the boards became warped so as to require the function for which the taper of the pin ,is provided. In order, therefore, to use the tapered pin with its necessarily-increased diameter in a practical manner, it is necessary to provide some other means of reinforcing the socket than a metal lining therefor, and

I provide for this purpose the angle or L shaped escutcheon-plate B, of which one lip engages below the board, the other extending over its edge, both lips being let into the board so as to be flush therewith, the upstanding lip which faces the edge having an aperture B of suitable diameter to accom'- modate without undue license the non-tapered portion of the tenon or protruding part of the dowel-pin. Such plate can be extended both sides of the position of the aperture B/ in both lips, so that screws b2 b2 may be set through the horizontal lip into the wood at a safe distance from the bore or socket D', on each side thereof, while screws b3 Z13 can be set in through the upstanding lip, so as to pass outside of the screws h2. By this arrangement the screws b3, which extend into the grain of .the wood in the same direction as the bore or socket D and which might cause some splitting strain where the board is weakened by the presence of said bore or socket and the insertion of the dowel-pin therein, are as remote as possible from said bore, and the screws b2, which are intermediate the bore and the pins b3, tend to reinforce the grain against the tendency of either the screws or the dowel-pin to split it. Preferably also the screws b3 are set as high as possible, so that any tendency which they might have to split the board will not be caused in identically the same plane as the like tendency caused by the presence of the bore. In order to afford a somewhat-increased bearing-surface for the tenon of the dowel-pin of the plate, said aperture lnay be flanged inward, as seen at b. This escutcheon-plate may be made of sheet metal, and the aperture being formed with a punch and die the flange b may be produced by striking inward a portion of the metal from the aperture B.

l. A dowel-pin of metal rod or wire, having a straight, substantially-cylindrical, portion at the inner end to serve as a pilot, and next to such pilot portion a portion which is thinned and widened to form lateral] y-projectin g fins, such thin portion being thicker at the middle of its width, and tapering off into thin lateral edges of such projecting lins.

2. A dowel-pin of metal rod or wire comprising an embedded or root portion having a straight, substantially-cylindrical, terminal to serve as apilot, and, forward of such pilot portion, a thinned and widened portion forming laterally-projecting ns, and tapered in thickness from the middle of its width to the lateral edges of such iins; and having a protruding or tenon portion which is of uniform cross-section for a distance from the root outward, and has a tapered outer terminal.

3.V A dowel-pin of metal rod or wire comprisin g an embedded or root portion and a protruding or tenon portion, having a tapered terminal and a straight or non-tapered portion back of such terminal; in combination with an L-shaped or angle socket escutcheonplate adapted to clasp the lower corner of the board having the socket, and having in its u standing lip an aperture adapted to recei e the'non-tapered portion of the tenon of the dowel-pin, having both lips extended laterally and provided with screw-holes in the two lips ont of range of each other and both beyond the socket.

4. A dowel-pin of metal rod or wire comprising an embedded or root portion and a protruding or tenon portion, having a tapered terminal and a straight or non-tapered portion back of such terminal, in combination with an L-shaped or angle socket escutcheonplate adapted to clasp the lower corner of the board which has the socket, and having in its upstanding lip an aperture adapted to receive the non-tapered portion of the tenon of the dowel-pin, having both lips extended laterally as respects the socket, the horizontal lip having screw-holes at opposite sides of the socket, and the vertical lip having screw-holes more remote from the socket than those of the horizontal lip.

5. In combination wit-h a dovrei-pin, an L- shapedI or angle socket escutcheon plate adapted to clasp the lower corner of the board which has the socket to receive the dowel-pin, and having in its npstanding lip an aperture registering with the socket and adapted to receive the pin, both lips of the plate being extended laterally' as respects the socket, and provided with screw-holes to secure the plate to the board, the screw-holes in the vertical lip being disposed at opposite sides of the position of the socket and above the level of the socket-aperture, and laterally more remote therefrom than the screw-holes of the horizontal plate.

In testimony whereof I have hereunto set my hand, in the presence of two witnesses, at Hastings, Michigan, this lst day of February, 1900.

EMIL TYDEN. In presence of- KITTIE F. BEADLE, NORA COOPER.

IOO 

